var HealthBar = Container.expand(function () {
	var self = Container.call(this);
	var healthBarGraphics = XS.getAsset('healthBar', 'Health Bar', .5, 1);
	healthBarGraphics.tint = 0x00FF00;
	self.addChild(healthBarGraphics);
	self.updateHealth = function (health) {
		self.scale.x = health / 100;
	};
});
var TargetIndicator = Container.expand(function () {
	var self = Container.call(this);
	var targetGraphics = XS.getAsset('target', 'Target Indicator', .5, .5);
	targetGraphics.alpha = 0.5;
	targetGraphics.y -= 30;
	self.addChild(targetGraphics);
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	self.health = 100;
	self.findNearestEnemy = function (enemies) {
		var nearestEnemy = null;
		var nearestDistance = Infinity;
		for (var i = 0; i < enemies.length; i++) {
			var dx = enemies[i].x - self.x;
			var dy = enemies[i].y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance < nearestDistance) {
				nearestDistance = distance;
				nearestEnemy = enemies[i];
			}
		}
		return nearestEnemy;
	};
	var playerGraphics = XS.getAsset('player', 'Player character', .5, 1);
	self.addChild(playerGraphics);
	var healthBar = new HealthBar();
	healthBar.y = -playerGraphics.height;
	self.addChild(healthBar);
	self.healthBar = healthBar;
	self.targetX = 2048 / 2;
	self.targetY = 2732 / 2;
	self.speed = 5;
	self.lastShot = 0;
	self.move = function () {
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > self.speed) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
			self.healthBar.updateHealth(self.health);
			return true;
		}
		self.healthBar.updateHealth(self.health);
		return false;
	};
	self.setTarget = function (x, y) {
		self.targetX = x;
		self.targetY = y;
	};
	self.shoot = function (enemies) {
		var bullet = new Bullet();
		bullet.x = self.x;
		bullet.y = self.y;
		var nearestEnemy = self.findNearestEnemy(enemies);
		if (nearestEnemy) {
			var dx = nearestEnemy.x - self.x;
			var dy = nearestEnemy.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			bullet.dx = dx / distance;
			bullet.dy = dy / distance;
		}
		return bullet;
	};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	self.health = 100;
	var enemyGraphics = XS.getAsset('enemy', 'Enemy character', .5, 1);
	self.addChild(enemyGraphics);
	var healthBar = new HealthBar();
	healthBar.y = -enemyGraphics.height;
	healthBar.children[0].tint = 0xFF0000;
	self.addChild(healthBar);
	self.healthBar = healthBar;
	self.healthBar.updateHealth(self.health);
	self.move = function () {};
});
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = XS.getAsset('bullet', 'Bullet', .5, .5);
	bulletGraphics.y -= 150;
	bulletGraphics.blendMode = 1;
	self.addChild(bulletGraphics);
	self.move = function () {
		self.x += self.dx * 5;
		self.y += self.dy * 5;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	self.sortGameObjects = function () {
		self.children.sort(function (a, b) {
			if (a === background || b === background) return 0;
			if (a === targetIndicator) return -1;
			if (b === targetIndicator) return 1;
			return a.y - b.y;
		});
	};
	var background = XS.getAsset('background', 'Background', .5, .5);
	background.x = 2048 / 2;
	background.y = 2732 / 2;
	self.addChild(background);
	var targetIndicator = new TargetIndicator();
	targetIndicator.x = 2048 / 2;
	targetIndicator.y = 2732 / 2;
	self.addChild(targetIndicator);
	var player = self.addChild(new Player());
	player.x = 2048 / 2;
	player.y = 2732 / 2;
	var enemies = [];
	for (var i = 0; i < 5; i++) {
		var enemy = self.addChild(new Enemy());
		enemy.x = Math.random() * (2048 - 500) + 300;
		enemy.y = Math.random() * (2732 - 500) + 300;
		enemies.push(enemy);
	}
	var bullets = [];
	XS.on('tick', function () {
		player.move(0, 0);
		var dx = player.targetX - player.x;
		var dy = player.targetY - player.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < player.speed && XS.ticks - player.lastShot >= 60) {
			player.lastShot = XS.ticks;
			var bullet = player.shoot(enemies);
			bullets.push(bullet);
			self.addChild(bullet);
		}
		if (distance < player.speed) {
			targetIndicator.visible = false;
		}
		for (var i = 0; i < enemies.length; i++) {
			enemies[i].move();
		}
		for (var i = 0; i < bullets.length; i++) {
			bullets[i].move();
		}
		self.sortGameObjects();
	});
	stage.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		pos.y = Math.max(pos.y, 500);
		player.setTarget(pos.x, pos.y);
		targetIndicator.x = pos.x;
		targetIndicator.y = pos.y;
		targetIndicator.visible = true;
	});
});

===================================================================
--- original.js
+++ change.js
@@ -149,8 +149,9 @@
 		self.sortGameObjects();
 	});
 	stage.on('down', function (obj) {
 		var pos = obj.event.getLocalPosition(self);
+		pos.y = Math.max(pos.y, 500);
 		player.setTarget(pos.x, pos.y);
 		targetIndicator.x = pos.x;
 		targetIndicator.y = pos.y;
 		targetIndicator.visible = true;